The InterMetro heavy-duty swivel casters gives you a handy way to provide mobility to your stationary shelving unit. These casters are designed to replace the leveling feet on your metro post to make the unit mobile. Each caster has an easy-to-use brake lock so you can keep your shelf from rolling around and they can swivel 360 degrees for ease of use. With a 300 pound weight limit and a durable plastic construction these casters are perfect for any InterMetro shelving unit.